Why is C₆H₅-CH(NH₂)-CH(CH₃)₂ named as 1-amino-2-methyl-1-phenylpropane ????

I thought the name wud end with the suffix -amine since -NH₂ group is the functional group but why is amino written here???

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'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane